Cutting-off tool and holder.



PATENTED MAY 12, 1908.

C. E. GHAMBERLIN. CUTTING OFF TOOL AND HOLDER.

APPLICATION FILED 11120.18. 190s.

- z SHEETS-SHEET 1.

INVENTOR masmm.

' PATENTED MAY 12, 1908. 0. E. OHAMBBRLIN.

CUTTING OFF TOOL AND HOLDER.

nruonron FILED DEO.18. 1905.

2 SHEETS-SHEET 2.

ITNESSES INVENTOR THE umzms PETERS cm, WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

CHARLES E. GHAMBERLIN, OF BETHLEHEM, PENNSYLVANIA, ASSIGNOR OF ONE-SIXTHTO EMIL A. GATHMANN, OF BETHLEHEM, PENNSYLVANIA.

CUTTING-OFF TOOL AND HOLDER.

Application filed December 18, 1905.

To all whom it may concern:

Be it known that I, CHARLES E. CHAMBER- LIN, a citizen of the UnitedStates, residing at N o. 516 Goepp street, Bethlehem, in the county ofNorthampton and State of Pennsylvania, have invented a new and usefulCutting-Off Tool and Holder, of which the following is a specification.

My invention relates to cutting off tools for that form of materialwhere a direct cut cannot be readily made by usual type of cutting offtools. Such forms of material are most frequently found in making andpreparing physical test bars or rods from forgings or castings. A hollowdrill or reamer is usually used in forming the bar or rod in materialfrom which test specimen is to be taken. When the bar has been thusshaped in the material to be tested it is, however, still integral withsaid material, being connected to the same at the bottom of annular cutmade by hollow drill or reamer.

The usual method of separating or cutting off the test bar hasheretofore been to drill into the material at approximately right anglesto the longer axis of said bar. This is a wasteful operation, consumingunnecessary material in specimen from which test is taken, and adding tothe expense of such test.

By my invention I am enabled to cut off a rod or bar formed in thematerial as previously stated, with a minimum loss and deformation ofmaterial from which bar is cut. I attain these objects by the mechanismillustrated in the accompanying drawings, in which Figure 1 is a planview of assembled holder and cutter. Fig. 2 is a cross-section on linesAA of Fig. 1 with parts cut away for convenience of illustration. Fig. 3is another lan view of assembled holder and cutter. ig. 4 is a view ofend of cutter with parts cut away for convenience of illustration. Fig.5 is a plan view of blade of cutter. Fig. 6 is an end view of Fig. 5.Fig. 7 is a plan view of feeding cam. Fig. 8 is a side view of Fig. 7. IFig. 9 is a plan view of feed shaft with parts broken away forconvenience of illustration. Fig. 10 is an end view of Fig. 9 showingpinion. Fig. 11 is a plan view of feed bolt. Fig. 12 is an end view ofFig. 11. Fig. 13 is a plan view of blade guide plate. Fig. 14 is an endview of Fig. 13.

Similar letters refer to similar parts throughout the several views.

Specification of Letters Patent.

Patented May 12, 1908.

Serial No. 292,282.

with the usual form of shank B. The forward part 0 of body A is made ofa diameter corresponding to the outside diameter of the hollow drill orreamer used in shaping bar.

The feed setting ring D has a cylindrical bearing portion d snuglyfitted over the stock A; this ring is held on the stock by set screws 6.Within the feed ring D is formed a cam d, which bears against the feedbolt F fitted with rack The feed bolt is located in a chamber G withinstock A, containing a spring H by which the bolt is kept inengagementwith cam surface d, a plug 1' closing one end of said chamber G. A feedshaft K, fitted with pinions k and 7c, is located in guide bearings Land transfers the feed motion imparted to rack f to the cutting blade T,which is provided with a rack W engaging the pinion 7c. The cutting edgeof blade is designated at U. A blade guide plate R, containing a recessS, is secured to the forward art of C by means of screws 1". A small hoe M in said guide plate R is in alinement with the feed shaft K, therebyallowing the pinion k to be moved clear of the rack W when a new cuttingblade is to be inserted or old one removed, a spring N normally keepingsaid pinion 7c in the engaged position with cuttlng blade rack W. Theforward part C of the body of holder A is provided with a recess 0 ofslightly larger diameter than the body of the bar or rod it is The bodyof holder A is preferably fitted desired to cut OH. The recess 0 isdecreased in diameter at P where the diameter should be such as to justeasily fit the bar enterin the said recess. A segment C of the forwarcpart C of body A is preferably cut away so as to open up the recess 0radially and thereby allow of ready removal of chips caused by thecutting off of the rod or bar by action of the blade T.

The use and operation of tool is as follows: A bar or rod having beenformed in any material by means of a hollow drill, reamer or the like,the feed ring D of the tool is turned until the cutting blade T ishoused within and clear of the recess 0. The part C of the tool is thenentered into the annular hole formed by the hollow drill or reamer, thebar or rod it is desired to cut off entering the recess 0. When the toolhas been entered to a depth at which the bar is to be cut oif'the toolis rotated about its greater axis in a direction so that the edge U ofthe blade T will cut into the bar or rod, when feed is given to same byturning the ring D. The feed is continued by moving of the said ring Duntil cutting blade T has been moved through about a semi-diameter ofthe rod or bar being cut off. The amount of movement of ring D to encomass the cutting off of bar can be determine by markings on its surfacewith reference to stock A, or can be gaged by listening for the sound ofsnap as bolt F reenters the high point of cam d. The rotation of tool onits longer axis and consequent cutting force of blade T can obviously beobtained in many manners; such as, for instance, fastening the shank Bof holder in a drill press or lathe chuclc The cutting off tool can beembodied as a single tool in combination with a hollow drill or reamer,if desired, but I prefer the simplicity of construction obtained in aspecial cutting off tool as described. Many variations of tool canobviously be made Without departing from the spirit of my invention.

7 Having thus described my invention, what I claim as new and desire toprotect by Letters Patent is:

1. A cutting tool consisting of a stock provided with an axial recessand a detachable plate having a guide way for a cutter at the end ofsaid stock in combination with a cutter extending across and ada ted tobe moved over the axial recess of saic stock.

2. A cutting tool of the character described provided with a cutterblade of a proximately segmental sha c, said bla e aving a rack on itsminor ace and an approximately semi-circular recess on its oppositeface, the cutting edge of blade being formed by the junction ofaforesaid recess with the latter face substantially as shown anddescribed.

3. In a cutting tool a stock provided with an axial recess, a cutteradapted to be moved across said recess, and means for guiding saidcutter in its movement, said means consisting of a recessed guide plateremovably attached to the recessed end face of the hollow stock.

4. In a cutting tool a stock provided with an axial recess, a cutteradapted to be moved across said recess, and means for guiding saidcutter in its movement, said means consisting of a uide late removablyattached to the recesse end face of the hollow stock.

5. In a cutting tool a stock or holder provided with a shank at one endand an axial recess at the other end, and a cutter movable transverselyof the recess located at or near this latter end, said cutter having arack and means for moving said cutter, comprising a pinion en againg therack of the cutter, a transverseIy movable rack en aging the pin ion anda cam sleeve arrange to engage one end of said rack.

6. A cutter of approximately segmental shape provided with a rack on oneface, and an approximately semi-circular recess on oposite face, thecutting edge of cutter being ocated at the junction of aforesaid recesswith the latter face, substantially as shown and described.

CHARLES E.. CHAMBERLIN.

Witnesses:

RoBT. B. REINHARD, EMIL A. GATnMANN.

